Description:
------------
Each time I create a new IntlDateFormatter instance, PHP 5.3.9 leaks memory. You 
can see in "top" that the RES column (resident size) keeps growing as long as the 
script is running; up to more than 500 MB for my example. (By the way, 
memory_get_usage() and the PHP memory limit don't report or act on this.)

I've noticed this because we're using long-running scripts with the 
PHP CLI - they eventually die when too much memory is used. This happens to me 
with older 5.3.x versions as well.

I tested with PHP 5.3.9 built with "./configure --enable-intl" on 64bit CentOS 
6.2, running in VMware Fusion on my Mac.

Thanks for looking into this, and for the great work on PHP!

Test script:
---------------
<?php

printf("Run 'top -p %s' in another shell to watch memory usage grow...\n", posix_getpid());

for ($i = 1; $i < 500000; $i++)
{
    $fmt = new IntlDateFormatter
    (
        'en_US',
        IntlDateFormatter::SHORT,
        IntlDateFormatter::NONE
    ); 
}

?>

Expected result:
----------------
[digicol@dcxcentos6vm ~]$ /usr/local/src/php-5.3.9/sapi/cli/php leak.php 
Run 'top -p 7211' in another shell to watch memory usage grow...

[digicol@dcxcentos6vm ~]$ top -p 7211

top - 00:13:05 up 12:37,  3 users,  load average: 0.34, 0.26, 0.34
Tasks:   1 total,   0 running,   1 sleeping,   0 stopped,   0 zombie
Cpu(s): 10.1%us,  3.7%sy,  0.0%ni, 79.7%id,  6.1%wa,  0.1%hi,  0.3%si,  0.0%st
Mem:   2054984k total,  1515064k used,   539920k free,   111760k buffers
Swap:   511992k total,   511992k used,        0k free,   121912k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                 
 7211 digicol   20   0  406m  21m  10m S  0.0  1.1   0:00.06 php    

Actual result:
--------------
[digicol@dcxcentos6vm ~]$ /usr/local/src/php-5.3.9/sapi/cli/php leak.php 
Run 'top -p 7211' in another shell to watch memory usage grow...

[digicol@dcxcentos6vm ~]$ top -p 7211

top - 00:01:18 up 12:26,  3 users,  load average: 0.95, 0.65, 0.50
Tasks:   1 total,   1 running,   0 sleeping,   0 stopped,   0 zombie
Cpu(s): 96.0%us,  3.3%sy,  0.0%ni,  0.0%id,  0.0%wa,  0.3%hi,  0.3%si,  0.0%st
Mem:   2054984k total,  1985784k used,    69200k free,    68784k buffers
Swap:   511992k total,   511860k used,      132k free,   122068k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                
 7211 digicol   20   0  908m 524m  10m R 97.9 26.2   1:15.58 php